THE RATIO RI FOR NONDISSOCIATIVE IONIZATION OF MOLECULAR-HYDROGEN BY ANTIPROTON PROTON IMPACT

The theoretical ratio R(i) of antiproton/proton cross sections for non dissociative ionization of hydrogen molecule has been obtained as a fu nction of the impact energy E in the range 30 less-than-or-equal-to E less-than-or-equal-to 2500 KeV lab. The required cross sections were c omputed in the close-coupling formulation of the semiclassical impact parameter theory using a simple one-active electron model for the mole cular target. The ratio R(i) is important for the analysis of the rece nt experimental data of Andersen et al. on antiproton scattering and t he understanding of the collisional mechanisms in the KeV range.